What is the meaning of Lugworm?

Any of several species of large marine annelid worm of the genus Arenicola

  1. especially the northern lugworm (Arenicola marina), whose coiled castings can often be seen on beaches at low tide.
  2. black lugworm (Arenicola defodiens)

especially the northern lugworm (Arenicola marina), whose coiled castings can often be seen on beaches at low tide.

black lugworm (Arenicola defodiens)

Source: wiktionary.org